Ask the Plumbing Experts! Sub-Flooring & Wax Rings Under Toilet.

Submitted by HomeWise Plumbing on July 22, 2013 - 5:30am

Q: I am adding a new sub-floor in my bathroom. Is it okay to stack two wax rings together to make up the difference under the toilet?

A: We see the negative results of this action all the time, and it usually leads to big problems! The answer is, "never!" The proper thing to do is to raise the floor flange, which is best done by a professional plumber. The tolerance for the height of the top of a flange ranges from flush with the floor to 1/2" proud, but then it is essential to choose the correct wax ring accordingly, of which there are 3 variations to choose from.